Safari/macOS often puts .kicad_pro on webkitRelativePath while name is
the stem. Match both, sniff JSON if the suffix is missing, and set
webkitdirectory on the input DOM so the folder picker actually recurses.
Apri progetto KiCad picks the folder that contains .kicad_pro and loads
sibling hierarchical sheets and the matching .kicad_pcb. Connectivity and
MPN/PNM/Value come from the schematic; a leftover PADS .asc is ignored.
A lone .kicad_pro upload is rejected unless that path exists on disk.
michele